Telephone apparatus



Dec. 8,1925. 1,564,290

S.f SNHT TELEPHbNE APPARATiJs Filed May 8, 1922 www 2f M @KM/Wl Patented Dec. 8, 1925.

UNITED STATES STUART F. SMITH, OF SAN FRANCISCQ, CALIFORNIA.

TELEPHONE APPARATUS.

Application filed May 8,

To @ZZ whom it may concern.'

Bc it known that I, STUART F. SMITH, a citizen of the United States, residing at San Francisco, in the county of San Francisco, State of California, have invented a new and useful rTelephone Apparatus. ot which the following is a speciiication in such full and clear terms as will enable those skilled in the art to construct and use the same.

T his invention relates to telephony and its objectis to provide means whereby the diaphragm movement-s of the receiving apparatus may be more accurately vibrated with respect to the movements ot the sending diaphragm and in as great amplitude as may be desired, whereby a loud speaking eiect may be more readily produced.

An object of the invention is to provide means whereby the current applied to the receiving apparatus or the sending` apparatus will be applied to opposite sides of the receiving diaphragm, the pulses of current being increased and diminished by the movements of the sending diaphragm.

The drawing is a sectional view of the transmitter and receiving apparatus with the battery and wiring system illustrated diagrammatically.

The sending apparatus consists of a flat cylindrical back 1 to which is secured the niouthpiece 2, the two parts being secured together by threads in a well known manner, and having a shoulder to secure the diaphragm 3 in a lined position.

Light springs 4 and 5 are secured within the two sending members by means ot screws 6 and 7, and the position of these springs may be adjusted by means ci screws 8 and 9. rlhe springs 4 and 5 carry any well known type of microphone transmitting apparatus as indicated at 10 and 11, which transmission apparatus is in turn operated by small projections 12 and 13 secured to the diaphragm 3.

The receiving apparatus consists of the earpiece 15 and cylindrical baci; 16 which is secured to the earpiece by threads in the usual manner. rThe back secures the diaphragm 17 between it and the earpiece similar to the way the diaphragm is held in the case of the sending apparatus.

Nithin the earpiece and its back are two spring members 18 and 19, which members are secured in place respectively by the screws 2O and 21. Other screws 22, 23 serve to adjust the position of the members 13 1922. serial No. 559,158.

and 19. The members 18 and 19 carry an armature as indicated' at 24, 25. These armatures are wound with suitable wire to produce electromagnets 26, 27.

The current for the apparatus is supplied trom the battery B, and is taken from a single wire 23 to the diaphragm 3. From the diaphragm it is delivered by means of the points l2 and 13 to the mircrophone transmitters 10 and 11, and from them through the wires 29, 30 to the electromagnets 26, 27 the arrangement being such that the impulses produced at the back of the diaphragm 3 will be applied as impulses to the diaphragm 17 by the electromagnet at the back of that diaphragm, and similarly the impulses transmitted from the front of the diaphragm 3 will be transmitted to the electromagnet 26. Wires 31, 32 extend from the magnets 26, 27 to a wire 33 leading to the battery.

In operation, impulses given to the diaphragm 3 will cause currents to vary through the back and front microphone transmitters 10 and 11, and similarly the currents produced will be applied to the electromagnets 26, 27 correspondingly in back and front of the diaphragm receiving apparatus. With this apparatus it is easily possible to produce a very loud speaking telephone because the impulses of the diaphragm may be greatly increased since it is positively operated in both directions, that is, a heavy current on one side of the diaphragm 3 will produce a light current on the opposite side, and the same effect will take place on both sides of the diaphragm 17. In the case of the ordinary apparatus with the microphone transmitter on one side only of the diaphragm, weak currents on one side of the diaphragm will produce weak currents on the same side of the receiving diaphragm with the result that there is practically no v tendency to operate the diaphragm outl of the plane of its normal position of rest, save in one direction and that toward the particular magnet used.

l/Vhat I claim is as follows, but various modifications may be made in the construction shown in the drawing and above particularly described form, within the purview of my invention:

1. In a telephone apparatus sending and receiving diaphragms, microphone transmitting apparatus on both sides of the sending diaphragm, a pair of electromagnets on opposite sides o' the receiving diaphragm1 means to transmit current from both sides of Vthe sending' diaphra'm to both sides of the receiving diaphragm, and means to adjust the position of the sending apparatus With respect to the diaphragm adjacent the same.

2. in a telephone apparatus a sending` and a receiving diaphragm, microphone transmitting apparatus on both sides oit the sending' diaphragm, eieotromagnets on both sides of' the receiving diaphragm, means to transmit current from hot-h sides of the sending diaphragm to both sides or the receiving diaphragm, means to adust the position oic the microphone apparatus with respect to the sending,v diaphragm, and means to adjust the position of the eieetron'iagnets with respect to the receiving diaphragm.

3. in a telephone apparatus sendingl and receiving` diaphragms, microphone transmitting' apparatus on both sides oi the sending diaphragm, eiectromagnets on both sides of the receiving diaphragnfi7 circuits for trans mit current from the microphone apparatus hoth sides of Jhe sending diaphragm to the eieetromapgnets on both sides of the fefzeiving diaphiagm7 and a single current source for supplying the sending;` and receiving' apparatus with current.

l. En c. teiephone apparatus the combinai with sending' diaphragm and a receivdiaphragm et' means on both sides of "l 'd diaphragme te mutually coopeieetriealiy to effect transmission or f a'seuree or' eieetrie current for ,1e apparatus with electric Curan; the receiving diaphragm is ifa 'he eieetrieai appara-tus on both :n t mony whereof have hereunto sei mj: Land this 253th day of pril A. D.A 192%.

STUART F. Sii/HTH. 

